Thermostat



April 12 1927. 1,624,790

B. KLAFTEN v THERMOSTAT Filed Feb. 16. 1924 y Pia-lenltdvAl" 12; 1.927.

' UNITED STATES` PATENT: ofFFlcE.

y BERTHOLD KLAETEN, o E BE'RLni-GRUNEWALD.. GERMANY.

- TnEEMosTAT.

applicati@ mea February 16.1924. sensi Naesam.-

stat is determined which dips into the boiler.

The vlength of the thermostat must be se- ,'15 lected comparatively great in order that the regulator shall 'be immersed for a sufficient depth into the water or steam, hot

' air or the like so that it reacts consequently to a determined average temperature. Thermostats, in which metallic or bi-metalli'c strips or elements are enclosed in a protecting tube, are known. Infthe thermostats of known type in which the element'for regulating the draught is mechanically controlled this is always effected in such Aa manner that l the' longitudinal expansion of the metallc or` lay-metallic elements or rodsis utilized for acting upon the draught regulating element. For the thermostat according to the 3 0 present invention, the outer dimensions of which are prescribed, nopractical solution in this way is possible owing to thec compara-4 tively low temperatures in consideration, so that two bi-metallic rods are used which are fixed at the lower ends so that the upper ends of the same: are freeas well to displace themselves in the longitudinal direction as to move towards one another or -awaythe one from the other.

' The v'invention consists 'inthat the several known means and arrangements are combined in such a manner that two bi-metallic `strips'are fixed with their lower ends on the bottom plate of #protecting tube and that 5 the upper ends carry articulated members which are connected withl one another after the manner of scissors and act mechanically upon an element of known type for adjusting the lever system of the draught registers.

. An embodiment of the invention is illus- :e trated by way of example in the accompany-v g drawing which shows a. partsectional and a part elevational-view. 1 is a protecting tube known p cap 2 adapted to be screwed therein. -Two thermostatic elements 3 are fixed in thiscap 2 so that they form in the normal position an .acute angle between` themselves. On the upper4 ends of these elements 3 arms 5 are pivoted at 4 which are vconnected with one anotherby a joint 6 after the manner of scissors blades. Asleeve 7 is screwed on the.

upper end of tube 1 and on. this sleevill" another sleeve 8 is screwed in the top plate of which a lifting pin 9 is guided. .The lifting pin 9 has at its lower end a disk `10 which bears on the upper ends of arms The lifting pin 9 projects lfrom the upper end of the sleeve 8 and bears against a lever 11 which carries a slidable weight 12 'on the one arm and to the other arm of which a chain .13 is attached which leads to thev draught Aregulating element. The lever 11 i is movably guided ina guide piece 14 which -is pivotally connected by means of a pivot boltjl with an arm 16 the bent end of -wh`ch isfi'xed on the upper end of sleeve 8 by a'.

screw 17. Owing to the 4expansion and contractionof the thermostatic elements 3 the ends of the arms 5, operating as scissors, are. raised or lowered whereby, through the intermediary of the elements 9, 10, 11, 12, 13 and. 14 the regulating` element is operated. This operation is indicated by dash and dot lines in the only ligure of the drawing. In the form of construction shown by way ofexample the bi-metallic thermostatic elements are made from zinc and iron.A The metals may however be .chosen atwill. Thel bi-metallic rods 3 of the thermostat are arranged the one with regard to the other so that the metals possessing a `low coefficient of expansion are situated on the inner side and -the metals possessing the` higher coeilicient of expansion are situated on the outer side. In this-arrangement the free ends of the rods will be moved towards one another owing to the expansion due to the increasing heat, but move away from one another at decreasing heat. To arrange the rods insuch a manner that their free ends move away from one another at inlcreasing heat and move towards-one another at the cooling vwould fall within th range ofthe present invention.

I claim v1. A thermostat comprising a protecting '.tube; a sleeve secured to the top of said er sev which 55' is closed at thev lowerend by means of a tube; a pair of thermostatic elements arranged in said tube; a pair of arms pivoted to each other ntermedlate thelr ends Aand one end of each arm being connected to the end of its respective thermostatic element; a

disk slidably mounted in said sleeve` and adapted to be operated by the other ends ot' .said arms; and a lifting pin secured to said disk and slidably mounted in said sleeve for transmitting the actionor` the thermostatic elements by means of. said arms.

2. A thermostat comprising a protecting tube; a sleeve secured to the top of said tube;

a pair of thermostatic elements arranged in said tube; a pair of arms pivoted to each other intermediate their ends and one end of each arm being connected to the end ot its respective thermostatic element; a disk slidably mounted in said sleeve and adapted to be operated by the other ends of said arms; and means for transmitting the action of the disk to a draft .register control.

3. A thermostat for a draft register eontrol comprising a painof thermostatic elements; a pair of arms-pivoted to each other intermediate their ends and one end of each arm being connected to the end of its respective thermostatic element; and means for transmitting the movement otl the other ends of said arms, in accordance with theaction of said elements, tothe draft register control.

4. A thermostat for a dratt register controlcomprising a pair of thermostatic elements; a protecting tube enclosing said'elements; a pair of arms pivoted to each other intermediate their ends and one end of each arm being connected to the endof its respectivethermostatic element; and means for transmitting the movement of the other-ends of said arms, in accordance with the action of said elements; to the draft register control.

5. A thermostat for a draft register controll comprising apair of thermostatic elements; a protecting tube enclosing said elements; a pair of arms pivoted to each other' intermediate their ends and one end of each arm being connected to the endof its respective'thermostatic element; and a disk and lifting pin associated with the other ends'of said arms for transmitting the movement of the thermostatic elements to the draft'register control.

4 6. A thermostat for a draft register control comprising a protect-ing tube; a cap se-l cured-at oneend on' said tube; a air of thermostat-ic elements in said tube having one end of each element projectinginto said cap a sleeve secured to the other end of sai tube; a air of arms pivoted to each other interme iate their ends and-one end of each arm being connected at the other .end of itsv respective thermostatic element; and means f in said sleeve for transmitting the movement of the other ends of said arms, in accordance with the action ofaid elements,`to the draft register control.

7. A thermostat for a'draftl'register* con-v trol comprising a protecting tube; a cap secured at one end on said tube; a pair of thermostatic elements in said tube 'having one end ot' each element projecting into said cap a sleeve secured to the other end of said tube; a dpair of arms pivoted to each other interme iate their ends and one end of each ,arm being connected at the other end of 'its' respective-thermostatic element; and a disk an lifting pin in said sleeve for transmit- BERTHOLD KLAFTEN. 

